http://freecircuitdiagram.com Free electronic circuit, schematic diagram, circuit diagram Thu, 18 Mar 2010 04:40:04 +0000 http://backend.userland.com/rss092 en http://freecircuitdiagram.com/2010/03/18/leds-and-integrated-circuits-flashing-box-video-tutorial/ High precision analog front end (signal conditioner) presented here can be used for portable ECG equipment that requires single-supply operation. There are two kind of amplifiers on the circuit diagram, the instrumentation amplifier INA326 and the dual precision amplifier OPA2335. Both operate from a single 5V supply and apply autozeroing techniques. Autozeroing techniques will keep [...]]]> http://freecircuitdiagram.com/2010/03/18/ecg-signal-conditioner/ http://freecircuitdiagram.com/2010/03/17/and-or-gates-video-tutorial/ This is Operational an Amplifier (Op-Amp) Oscillator circuit. This circuit has some advantages, they are this circuit can be operated at low frequencies with relatively small capacitors, it has a completely-symmetrical output waveform along with a buffered output and it will always self start and cannot hang up because there is less dc positive feedback [...]]]> http://freecircuitdiagram.com/2010/03/13/operational-amplifier-op-amp-oscillator/ This is a circuit of board system monitoring for temperature and voltage condition. It uses the NE1617A. The NE1617A is a 2 channel temperature sensor. It can measure remote and internal sensor. It also supports up to nine devices per bus. The temperature data update is selectable from 125 ms to 16 seconds, if it [...]]]> http://freecircuitdiagram.com/2010/03/12/board-system-monitoring-for-temperature-and-voltage-condition/ This is a circuit of SA58672 Small Class-D Audio Amplifier. This circuit is suitable for mobile device. It  has maximum output power of 3.0 W  for a 4ohm load and 1.7W for 8ohm load with power supply of 5V. If we uses 3.6 V power supply, the maximum output power is 900mW with 8ohm load. [...]]]> http://freecircuitdiagram.com/2010/03/12/sa58672-small-class-d-audio-amplifier-for-mobile-device/ This is a circuit of Power-Fail and Low-Line Signals. This circuit is used to warn the processor when the power failure or a brownout is occurs. The processor will enter a power-down routine, when either of those signals interrupts the processor. Back up important data prior to the POR placing the processor in reset and [...]]]> http://freecircuitdiagram.com/2010/03/11/power-fail-and-low-line-signals/ http://freecircuitdiagram.com/2010/03/11/radio-control-rc-servo-motor-with-pwm-video-tutorial/ The configuration in the circuit diagram below can be used when a slow rise time of the output voltage is required. We can find the rise time with following formula: ton= CVoR 0.45 Capacitor C is discharged when the switch position is ON and this will maintain the voltage at pin 2 low. The Vo follows the voltage [...]]]> http://freecircuitdiagram.com/2010/03/10/soft-start-mechanism-for-l200-voltage-regulator/ It’s good to reduce the power dissipated by the device. Using resistor connected in series to the input (the left figure) is a simple and economic method to reduce the device input-output differential voltage. Here’s the formula for calculating R: R= [Vi min- (Vo+Vdrop)]/Io Vdrop = minimum differential voltage between the input and the output of the [...]]]> http://freecircuitdiagram.com/2010/03/10/reducing-l200-power-dissipation-using-series-resistor/